Summary Box: LinkedIn 1st post-IPO bow impresses

GOOD FIRST IMPRESSION: LinkedIn gave Wall Street what it wanted in its first quarterly report since its ballyhooed initial public offering in May. The online professional networking service's revenue and membership growth accelerated and the company posted higher earnings to the pleasant surprise of analysts who were bracing for a loss.

MARKET REACTION: LinkedIn's stock rose in extended trading. That's a sign the second-quarter numbers were good enough to support LinkedIn's lofty market value, which has more than doubled from the IPO price of $45 per share.

RIPPLE EFFECT: This could feed the excitement mounting for other Internet IPOs.